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An integrated approach for identity and access management in a SOA context 11

An integrated approach for identity and access management in...

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Proceedings of the 16th ACM symposium on Access control models and technologies

作者： Hummer, Waldemar Gaubatz, Patrick Strembeck, Mark Zdun, Uwe Dustdar, Schahram Distributed Systems Group Information Systems Institute Vienna University of Technology Austria Software Architecture Group Faculty of Computer Science University of Vienna Austria Information Systems Institute Vienna University of Economics and Business Austria

ISBN: (纸本)9781450307215

In this paper, we present an approach for identity and access management (IAM) in the context of (cross-organizational) serviceoriented architectures (SOA). In particular, we defined a domainspecific language (DSL) for role-based access control (RBAC) that allows for the definition of IAM policies for SOAs. For the application in a SOA context, our DSL environment automatically produces WS-BPEL (Business Process Execution Language for Web services) specifications from the RBAC models defined in our DSL. We use the WS-BPEL extension mechanism to annotate parts of the process definition with directives concerning the IAM policies. At deployment time, the WS-BPEL process is instrumented with special activities which are executed at runtime to ensure its compliance to the IAM policies. The algorithm that produces extended WS-BPEL specifications from DSL models is described in detail. Thereby, policies defined via our DSL are automatically mapped to the implementation level of a SOA-based business process. This way, the DSL decouples domain experts' concerns from the technical details of IAM policy specification and enforcement. Our approach thus enables (non-technical) domain experts, such as physicians or hospital clerks, to participate in defining and maintaining IAM policies in a SOA context. Based on a prototype implementation we also discuss several performance aspects of our approach. © 2011 ACM.

关键词： Web services

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A science gateway getting ready for serving the international molecular simulation community 2

A science gateway getting ready for serving the internationa...

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2012 EGI Community Forum / EMI 2nd Technical Conference, EGICF-EMITC 2012

作者： Gesing, Sandra Herres-Pawlis, Sonja Birkenheuer, Georg Brinkmann, André Grunzke, Richard Kacsuk, Peter Kohlbacher, Oliver Kozlovszky, Miklos Krüger, Jens Müller-Pfefferkorn, Ralph Schäfer, Patrick Steinke, Thomas Center for Bioinformatics Department of Computer Science University of Tübingen Sand 14 Tübingen72076 Germany Department of Chemistry Ludwig-Maximilians-University Munich Butenandtstr. 5-13 München81377 Germany Paderborn Center for Parallel Computing University of Paderborn Warburger Str. 100 Paderborn33089 Germany Johannes Gutenberg-University Mainz Mainz55099 Germany Center for Information Services and High Performance Computing Technische Universität Dresden Zellescher Weg 12-14 Germany Laboratory of Parallel and Distributed Systems MTA SZTAKI Kende Street 13-17 Budapest1111 Hungary Zuse Institute Berlin Takustraße 7 Berlin14195 Germany

The project MoSGrid (Molecular Simulation Grid) has been developing a web-based science gateway supporting the community with various services for quantum chemistry, molecular modeling, and docking. Users gain access to distributed computing infrastructures (DCIs) via intuitive user interfaces for sophisticated tools, specialized workflows, and distributed repositories. Currently, the MoSGrid community consists of about 120 users from a number of fields related to chemistry and bioinformatics located in Germany. However, the underlying security infrastructure is generally applicable and can be deployed in arbitrary projects. MoSGrid intends to address the international community by participating in the EU-projects SCI-BUS (Scientific gateway Based User Support) and ER-flow (Building an European Research Community through Interoperable Workflows and Data), and collaborating with the EU-project EDGI (European Desktop Grid Initiative). © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

关键词： Quantum chemistry

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An Experimental Facility for Wireless Multi-hop Networks in Future Internet Scenarios

An Experimental Facility for Wireless Multi-hop Networks in ...

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IEEE/ACM Int'l Conference on & Int'l Conference on Cyber, Physical and Social Computing (CPSCom) Green Computing and Communications (GreenCom)

作者： Oliver Hahm Mesut Gunes Felix Juraschek Bastian Blywis Nicolai Schmittberger Institute of Computer Science Computer Systems and Telematics Distributed Embedded Systems Freie Universität Berlin Germany

Next to traditional communication systems like servers or routers at the backbone and personal computers or laptops acting as clients, the Future Internet will additionally comprise many so-called smart objects. Most of everyday devices like coffee machines, fridges, or light switches will participate in this Internet of Things (IoT).Small-sized computers will connect these devices to the network by establishing low power wireless links. To achieve this vision various kinds of wireless multi-hop networks (WMHNs) play an important role. During the last years, it has become clear that test bed-based research is mandatory in order to develop suitable protocol implementations and metrics for these networks. In this article, we review network configurations for wireless networks for the IoT. We describe the DES-Test bed at the Freie Universitat Berlin as an experimental facility to study these network configurations. In addition to the infrastructure and software provided by the test bed, we introduce μkleos as a micro kernel based operating system for embedded devices. We designed μkleos with a special focus on Wireless Sensor Networks (WSNs) to complement our approach to study WMHNs. μkleos provides an implementation of 6LoWPAN to interconnect WSNs to IP-based networks.

关键词： Wireless sensor networks Internet Protocols Wireless networks Software Mobile communication

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A comparison of Wireless Fidelity (Wi-Fi) fingerprinting techniques

A comparison of Wireless Fidelity (Wi-Fi) fingerprinting tec...

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2011 International Conference on ICT Convergence, ICTC 2011

作者： Del Mundo, Lersan B. Ansay, Rafael Lean D. Festin, Cedric Angelo M. Ocampo, Roel M. Networks and Distributed Systems Lab. Department of Computer Science University of the Philippines Diliman Quezon City 1101 Philippines Computer Networks Lab. Electrical and Electronics Engineering Institute University of the Philippines Diliman Quezon City 1101 Philippines

ISBN: (纸本)9781457712678

Among several techniques proposed for indoor positioning using IEEE 802.11 Wireless Fidelity (Wi-Fi) based networks, those that rely on fingerprinting have been demonstrated to outperform those based on lateration, angulation, and cell of origin in terms of accuracy. We compare and evaluate three Wi-Fi fingerprinting techniques that use the K-Nearest Neighbor (k-NN), Naive Bayes Classifier (NBC) and Support Vector Machine (SVM) algorithms. Our experiments show that SVM-based fingerprinting outperformed both k-NN and NBC-based fingerprinting, achieving accuracies of 2 meters or better within our testbed. © 2011 IEEE.

关键词： Indoor positioning systems

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Challenges and limits of flooding and gossip routing based route discovery schemes

Challenges and limits of flooding and gossip routing based r...

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Conference on Local computer Networks (LCN)

作者： Bastian Blywis Mesut Guenes Felix Juraschek Oliver Hahm Institute of Computer Science-Distributed Embedded Systems Freie Universität Berlin Germany

Motivated by our experience from previous testbed-based studies, we discuss the performance of flooding based route discovery schemes. Based on an empirical case study, the limits of routing in IEEE 802.11 wireless multi-hop networks are highlighted. We show that the route discovery itself can already lead to problems even when there are no or few data flows.

关键词： Routing protocols Routing Wireless communication Ad hoc networks Payloads Mobile computing

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Fast RNA structure alignment for crossing input structures

Fast RNA structure alignment for crossing input structures

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作者： Backofen, Rolf Landau, Gad M. Möhl, Mathias Tsur, Dekel Weimann, Oren Bioinformatics Institute of Computer Science Albert-Ludwigs-Universität Freiburg Germany Department of Computer Science University of Haifa Haifa 31905 Israel Department of Computer Science and Engineering NYU-Poly Six MetroTech Center Brooklyn NY 11201-3840 United States Programming Systems Lab Saarland University Saarbrücken Germany Ben-Gurion University Beer-Sheva Israel Massachusetts Institute of Technology Cambridge MA 02139 United States

The complexity of pairwise RNA structure alignment depends on the structural restrictions assumed for both the input structures and the computed consensus structure. For arbitrarily crossing input and consensus structures, the problem is NP-hard. For non-crossing consensus structures, Jiang et al.'s (2002) [9] algorithm computes the alignment in O(n2m2) time where n and m denote the lengths of the two input sequences. If the input structures are also non-crossing, the problem corresponds to tree editing which can be solved in O(m2n(1+lognm)) time (Demaine et al., 2007) [3]. We present a new algorithm that solves the problem for d-crossing structures in O(dm2nlogn) time, where d is a parameter that is one for non-crossing structures, bounded by n for crossing structures, and much smaller than n on many practical examples. Crossing input structures allow for applications where the input is not a fixed structure but is given as base-pair probability matrices. © 2010 Elsevier B.V. All rights reserved.

关键词： RNA

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DES-Chan: A framework for distributed channel assignment in wireless mesh networks

DES-Chan: A framework for distributed channel assignment in ...

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Australasian Telecommunication Networks and Applications Conference, ATNAC

作者： Felix Juraschek Mesut Güneş Matthias Philipp Bastian Blywis Oliver Hahm Distributed Embedded Systems-Institute of Computer Science Freie Universität Berlin and Humboldt University Berlin Germany

In this paper we present the DES-Chan framework for experimentally-driven research on distributed channel assignment algorithms in wireless mesh networks. The implementation process of channel assignment algorithms is a difficult task for the researcher since common operating systems do not support channel assignment algorithms out of the box. DES-Chan provides a set of common services required by distributed channel assignment algorithms. The modular architecture of DES-Chan allows the extensions with further modules or the modifications of existing ones. As a proof of concept, we present a reference implementation of a distributed greedy channel assignment algorithm. We evaluate its performance in the DES-Testbed, a multi-transceiver wireless mesh network (WMN) with 100 nodes at the Freie Universität Berlin.

关键词： Interference Switches Topology Network topology Wireless networks Data structures

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Experiences from the MANIAC Challenge

Experiences from the MANIAC Challenge

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Australasian Telecommunication Networks and Applications Conference, ATNAC

作者： Heiko Will Felix Juraschek Mesut Güneş Jochen Schiller Distributed Embedded Systems Institute of Computer Science Freie Universität Berlin and Humboldt University Berlin Germany

The MANIAC Challenge is a competition for cooperation strategies in wireless ad-hoc networks with the focus on experimental evaluation. We present the results of the MANIAC Challenge and discuss characteristics of real networks such as link instability and mobility, which are often simplified in common network simulators. We introduce our strategy Friendly Clustering that won the Performance Award. Friendly Clustering is based on monitoring the neighbors' forwarding behavior and assessing their willingness to relay future data packets. Further on, we describe the challenges in implementing the strategy for real networks, such as the DES-Testbed at the Freie Universität Berlin and the ad-hoc network of the MANIAC Challenge.

关键词： Routing Ad hoc networks Monitoring Wireless sensor networks Mobile computing Unicast Wireless communication

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Growth- and Entropy-Based SOA Measurement: Vision and Approach in a Large Scale Environment

Growth- and Entropy-Based SOA Measurement: Vision and Approa...

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Joint Conference of the Int'l Workshop on and International Conference on Software Process and Product Measurement Software Measurement

作者： Anja Fiegler Reiner R. Dumke Software Engineering Group Institute for Distributed Systems Faculty of Computer Science Otto-von-Guericke University of Magdeburg Magdeburg Germany

Service-oriented architectures (SOA) can be considered as an enabling methodology for Cloud Computing and the IT's industrialization, standardization and commodity approach. The efforts to effectively introduce SOA were driven by the evermore increasing complexity and volume of information to be consumed. This paper discusses in this context some major quality characteristics of SOA systems and new measurement approaches, considering complex IT systems and digital ecosystems. This approach is based on growth models related to SOA's reference architecture as well as diversity and entropy. On a field test certain metrics are applied to a real large scale SOA system. As a result some major and important characteristics of the SOA system can be proven and weak structures in services orchestrations exposed.

关键词： Service oriented architecture Semiconductor optical amplifiers Entropy Business Complexity theory Biological system modeling

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The influence of the spatial separation of control elements on the workload for mobile information systems 11

The influence of the spatial separation of control elements ...

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13th International Conference on Human-computer Interaction with Mobile Devices and Services, Mobile HCI 2011

作者： Ziegler, Jens Graube, Markus Suhrbier, Alexander Wessel, Niels Malberg, Hagen Urbas, Leon Department of Distributed Control Systems Engineering Institute of Automation Dresden University of Technology 01062 Dresden Germany Institute for Applied Computer Science KIT Karlsruhe Institute of Technology 76344 Eggenstein-Leopoldshafen Germany Department of Physics Humboldt-Universität Zu Berlin 10115 Berlin Germany Institute for Biomedical Engineering Dresden University of Technology 01062 Dresden Germany

ISBN: (纸本)9781450305419

Mobile information systems (MIS) are finding their way into private and business every-day activities. There are also increased attempts to establish MIS for on-site activities in industrial facilities. Industrial environments, however, place significantly higher demands on mobile user interfaces than office or home environments. Common interaction styles are often unsuitable for this domain. MIS comprising specialized configurations like wearable systems might overcome current limitations. Wearable systems make it possible to arrange system components in the immediate environment of the user's body in order to create an ergonomic and intuitive user interface. However, the use of distributed, body-worn user interfaces, and in particular separation of input and output devices, might increase the workload for the user. This study examines the extent to which the separation of input and output devices affects the workload for wearable MIS. Three interaction styles in two different configurations are investigated with four different measures to determine the workload covering both objective and subjective indicators. This investigation shows that there is no significant increase of workload in general. However, the measurement of the heart rate variability revealed subtle but significant differences between the two configurations, particularly for one interaction style. These findings indicate that physiological measures can provide more detailed and subtle information about additional workload and its source than other measures. © 2011 ACM.

关键词： Human computer interaction

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